Testing if a Jasmine Test Fails

I'm trying to write a plugin for Jasmine that allows you to return a promise from a spec and will pass or fail that spec depending on whether or not the promise is fulfilled or rejected.

Of course, I want to write tests to make sure that my plugin works correctly, and to be thorough, I need to make sure that tests fail when the promise is rejected... so how do I make a test pass when I need to make sure that a test "successfully fails"?